Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b2456aee542d00…

MALICIOUS

PDF

81.2 KB Created: 2021-03-03 23:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ea649cc90aa33ed5746cd383dc945776 SHA-1: 2735e1e1a4a47621d24c3d47a978c8d0da3f7b06 SHA-256: f2b2456aee542d00e32d0f31479a3a7111c853f0a033fd6248184df9bab1858e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/wix?keyword=minecraft+apk+1.2.8.0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448539/normal_601ebc66af73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_602e5fceed75f.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/20481076295.pdfIn PDF document text
    • http://aycotoro7.xyz/94990169188rpj6a.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/honeywell_home_rth221b1021_e1_rth221b1021_programmable_thermostat_off_white.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/lamborghini_gallardo_superleggera_top_speed.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/bowajijudibikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_601bfbf85e73c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fed6597556ca.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/9535658551.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/bloody_chamber_summary_and_analysis.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/cell_phones_for_sale_in_meridian_idaho.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ff48b4d19b8e.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/symbolic_form_logic_calculator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/bojejonijowowikumopitolo.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/what_does_cast_off_mean_in_hebrew.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/6809176651.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 5420 bytes
SHA-256: c112046533e861cfe650d6b990ee3a301c13263448c97fee1eec1cab632c7b7a
font_01_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 11044 bytes
SHA-256: c9c22e023ebeefe32f743dad858ac71ba37e50de1c6abcdc3efd6c2f851e1737